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using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Data.Linq;
namespace System.Data.Linq.SqlClient {
internal class SqlAggregateChecker {
Visitor visitor;
internal SqlAggregateChecker() {
this.visitor = new Visitor();
}
internal bool HasAggregates(SqlNode node) {
visitor.hasAggregates = false;
visitor.Visit(node);
return visitor.hasAggregates;
}
class Visitor : SqlVisitor {
internal bool hasAggregates;
internal Visitor() {
}
internal override SqlExpression VisitSubSelect(SqlSubSelect ss) {
return ss;
}
internal override SqlSource VisitSource(SqlSource source) {
return source;
}
internal override SqlExpression VisitUnaryOperator(SqlUnary uo) {
switch (uo.NodeType) {
case SqlNodeType.Min:
case SqlNodeType.Max:
case SqlNodeType.Avg:
case SqlNodeType.Sum:
case SqlNodeType.Count:
case SqlNodeType.LongCount:
this.hasAggregates = true;
return uo;
default:
return base.VisitUnaryOperator(uo);
}
}
}
}
}
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